Study of the molecular tilt angle and the order parameter of a ferroelectric liquid crystal mixture using IR spectroscopy

Kocot, A.; Kruk, G.; Wrzalik, R.; Vij, J. K.

doi:10.1080/02678299208032815

Cited by 31 publications

(12 citation statements)

References 8 publications

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“…The interpretation of these results is ambiguous because this procedure requires assumptions about the orientational distribution functions for different molecular segments and their tilting angles. In contrast, absorption measurements carried out on a complete set of polarizations of the IR beam supply direct information about rotational bias and mutual arrangements of molecular segments [7]. Such types of studies have also been performed under static conditions (i.e., under dc voltage) with several nonpolymeric antiferroelectrics [8,9].…”

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confidence: 99%

Time-Resolved Fourier-Transform Infrared Spectroscopy on the Inter- and Intramolecular Orientational Dynamics in Ferroelectric Liquid Crystalline Dimers

et al. 1997

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On a base of time-resolved step-scan IR-spectroscopy data, we present a detailed model of the segmental reorientation during the ferroelectric and electroclinic switching of a chiral liquid crystalline dimer. We detected that the magnitude of the motion of the molecular segments differ from each other: The tilt angle is maximal for the mesogens and minimal for the "virtual polysiloxane backbone." In contrast to a recently published conjecture, we prove that in the ms scale the responses of different molecular segments are unambiguously synchronous with each other. [S0031-9007(97)

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confidence: 99%

Time-Resolved Fourier-Transform Infrared Spectroscopy on the Inter- and Intramolecular Orientational Dynamics in Ferroelectric Liquid Crystalline Dimers

et al. 1997

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“…The dichroic ratio R (from now on) is defined as A /A ⊥ while the orientational order parameter S is calculated using the equation derived in Ref. [23],…”

Section: A Polarized Ir Spectroscopymentioning

confidence: 99%

Chiral smectic-Aand smectic-Cphases with de Vries characteristics

et al. 2017

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“…16 ͒ If the angular coordinates of a molecule are ␤ and ␥ as in Fig. 7, the orientational distribution function ͑␤ , ␥͒ will be taken to be 7 4 ͑␤,␥͒ = 1 + 3A sin ␤ sin ␥ + 5BP 2 …”

Section: Microscopic Considerationsmentioning

confidence: 99%

“…This technique was first applied in the early 1990's to the study of the ferroelectric liquid crystalline materials and in particular for determining the tilt angle and the orientational order parameter. 2 Recently, the technique has been used to determine a complete set of second rank orientational order parameters. 3,4 The orientational distribution function of the directors in smectic layers has been determined for the ferroelectric liquid crystals first by Fukuda et al 5 In this paper we theoretically investigate the absorbance as a function of the angle of polarization where a ferroelectric liquid crystal is confined to lie between the two windows of a cell.…”

Section: Introductionmentioning

confidence: 99%

Propagation of an electromagnetic wave in an absorbing anisotropic medium and infrared transmission spectroscopy of liquid crystals

Scaife

Vij

2005

The Journal of Chemical Physics

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The theory of absorbance is developed for the entire electromagnetic spectrum of radiation in a semi-infinite anisotropic medium with a second rank dielectric tensor, the elements of which are complex and frequency dependent. The theory of the absorbance A͑ , ͒ of an optically anisotropic liquid in an infrared ͑IR͒ test cell is then outlined and applied to IR transmission experiments. A formula for the dependence of A͑ , ͒, on ͑ being the angle between the electric vector and the principal optical axis͒ is derived from first principles. The formula, for radiation of angular frequency , viz, A͑ , ͒ = −log 10 ͓10 −A͑ ,0͒ cos 2 +10 −A͑ , /2͒ sin 2 ͔ is in agreement with that proposed by Jang, Park, Maclennan, Kim, and Clark ͓Ferroelectrics 180, 213 ͑1996͒ ͔ and confirms some of the work of Kocot, Wrzalik, and Vij ͓Liq. Cryst. 21, 147 ͑1996͔͒. The comments on this formula by Jang, Park, Kim, Glaser, and Clark ͓Phys. Rev. E 62, 5027 ͑2000͔͒, and by Kocot et al. are discussed. The absorbance A͑ ,0͒ and A͑ , /2͒ have been expressed in terms of the optical properties of the material and the dimensions of the cell.

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Study of the molecular tilt angle and the order parameter of a ferroelectric liquid crystal mixture using IR spectroscopy

Cited by 31 publications

References 8 publications

Time-Resolved Fourier-Transform Infrared Spectroscopy on the Inter- and Intramolecular Orientational Dynamics in Ferroelectric Liquid Crystalline Dimers

Time-Resolved Fourier-Transform Infrared Spectroscopy on the Inter- and Intramolecular Orientational Dynamics in Ferroelectric Liquid Crystalline Dimers

Chiral smectic-Aand smectic-Cphases with de Vries characteristics

Propagation of an electromagnetic wave in an absorbing anisotropic medium and infrared transmission spectroscopy of liquid crystals

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